Rugops

Comparatively weak this Abelisaurid was not primarily a predator, but instead primarily a scavenger. It has a weak skull compared to many hunters which lived in its time and place, though doubtlessly it would have hunted at times for small prey. Even though small fry in its time and place, Rugops was larger than any land mammal carnivore that has ever existed. Still, it skulked in the shadows of the larger theropods. However its was an efficient creature, eating the scraps of Spinosaurus.